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404 N <br /> et <br /> - Sequoia w Walnut Creek.CA 945988 <br /> _ (925)988-96W_ <br /> Analytical FAX{925)988-9673 <br /> wwwrr sequoialalxs corn <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal# 1205 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 08-Feb=01 07 55 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control - <br /> _ _ _ __ _ _—,—Sequoia Analytical--Walnut Creek— <br /> Reporting <br /> reek__Reporting Spike Source %REC RPD <br /> Analyte Result Lunn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1A16024-EPA 5030B [PIT] <br /> Blank(1A16024-BLKI) Prepared&Analyzed 18-Jan-01 <br /> Ethanol ND 500 U911 <br /> tent-Butyl alcohol ND SO " <br /> Methyl tori-butyl ether ND 20 " <br /> j Di-isopropyl ether ND 20 " <br /> Ethyl tori-butyl ether ND 20 " <br /> tert-Amyl mothyl other ND 20 " <br /> 1,2-Dichloroethme ND 20 " <br /> Ethylene dibromrde ND 20 " <br /> Surrogate Dibromofluoromethane 518 500 106 50.150 <br /> Surrogate 1 1 Drehloroethane-d! 498 SO 0 996 50-150 <br /> LCS(1A16024-BSI) Prepared&Analyzed 18-Jan-01 <br /> Methyl tert-butyl ether 520 20 ugll 500 104 70-130 <br /> Surrogate Dibromofluoromethane S61 Soo 112 50-150 <br /> Surrogate 1 1 Drchloroedwm-d4 518 " SO 0 104 50-150 <br /> Matrix Spike(lA16024-MSI) Source W101329-06 Prepared&Analyzed 18-Jan-01 <br /> Methyl tort-butyl.other 563 20 u811 500 ND 113 60-150 <br /> Surrogate Dbromofluorome0now S80 " Soo 116 50-150 <br /> Surrogate 1,2 Drehloroethane-d4 SS 1 SO 0 110 50-150 <br /> Matra Spike Dup(lA16024-MSDI) Source W101329-06 Prepared&Analyzed 18-Jan-01 <br /> Methyl tert-butyl ether 595 20 ugn 500 ND 119 60-150 5 53 25 <br /> Surrogate Dibromofluoromethane 589 500 118 50-150 <br /> Surrogate 1,1-Drch1.oroedmw-d4 S56 500 111 SO-150 <br /> Sequoia Allabrtical-Walnut Creek ~The results in dlus report apply to the samples analyzed in accorrlmrce with the charm of <br /> custody document This analyrieal r+eporl must be reproduced to its entrr+e4p <br /> Page 13 of 14 .� <br />